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Criminal Law - DWI - Family Law - Personal Injury
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The Trusted Lawyers in St. Charles Since 1999

As the lawyers St. Charles has trusted since 1999, Byrnes Law Firm is available to clients throughout St. Louis County. We understand that when you call us, you are likely going through one of the worst times of your life. That is why we offer free consultations and provide our services in a personal, professional, and confidential manner.

Whether you have a family law matter, personal injury, DUI, or criminal charges, Bill Byrnes and the staff of Byrnes Law Firm will give you their full attention. While Bill Byrnes has consistently ranked within the top 100 DUI lawyers in Missouri, he understands that each case is unique and therefore requires careful consideration and handling. He will provide legal services in a manner that is thoughtful, determined, and within the best interests of you, the client.

We’re a St. Charles law firm that will strive to rise past your expectations, and we’ll be strategic in our approach to your case, and defending your rights. Bill Byrnes gives you the personal attention your case deserves, treats you with respect, and fights like hell to make sure the best possible outcome of your case, is what you get.

Byrnes Law Firm Wins — and We’ll Win for You, Too!

Byrnes Law Firm practices in many areas of criminal law, including DUI arrests, drug possession arrests, weapons, theft, forgery, and other criminal charges. We also practice in the areas of family law (divorce, custody, support) and personal injury. Most importantly, when we take on a case, we have two primary goals in mind: to fight for our clients’ interests and to win.

CALL OUR OFFICE to set up a FREE CONSULTATION. We are available 24 hours a day, 7 days a week to take your call.

Why Call Byrnes Law Firm?


For nearly 20 years, Bill Byrnes has been preserving the rights individuals and families across the state of Missouri. He’s trusted to win by clients throughout St. Louis County, including St. Charles, St. Louis, and surrounding areas.


Bill is more than just “some lawyer”; he truly cares, and treats each client with the kind of personalized attention and respect that are rare among lawyers. How far will bill go for his clients? Take a look at this.

Proven Results

As one of the few lawyers in the St. Louis area that have actually set case law, Bill Byrnes is well-equipped to take on your case — and win it. Based on the thousands of cases he’s represented over the years, it’s safe to say you are in good hands with Byrnes Law Firm.

This will be my next lawyer if I ever need one. I have seen him in action in Warrenton. If anyone ever needs a lawyer and cannot find his number, let me know. I have it on my refrigerator!
- Elaine Frei
Byrnes Law St. Charles Office

St. Charles Law Office

You can meet our law team to discuss your case in St. Louis or St. Charles. Our St. Louis Office is in Clayton, Missouri just behind the St. Louis County Courthouse.

The office is surrounded by ample metered parking. We do not have handicap access here. If this is a concern we will see you in our St. Charles office or gladly come to you.


  • Drug Possession
  • Assault
  • Domestic Assault
  • Restraining Orders
  • Marijuana Offenses
  • Possession of a Controlled Substance
  • Distribution of a Controlled Substance
  • Stealing and Theft
  • Burglary
  • Weapons Offenses
  • Probation Violations
  • Juvenile Crimes
  • Warrant Recalls
  • Drug Trafficking
  • Bond Reduction Hearings
  • …and other charges

Drunk Driving

A DWI charge can lead to losing your driver’s license, jail time, and large fines. It’s important that you speak to an attorney so that you can be prepared and have a great defense on your side. Bill can help you.

Criminal Law

Drug Possession in St. Louis can result in hefty fines and several years in prison. Large amounts can increase the penalties. We can help you to achieve the best possible outcome for your case. Bill has extensive experience and will fight for you.

Drug Charges

Distribution of a controlled substance is a felony offense, which has very serious consequences. Byrnes Law Firm has handled many cases just like this, including a recent case involving 84 pounds of marijuana. The driver was ultimately released with just a fine.

Family Law

Anna Lammert is a strong advocate for her clients. Whether you want to go to trial with your divorce case or settle outside of court, Anna can guide you through the entire process to help ease you through the difficult transition of divorce and the many sensitive issues that come with it.

24 -7 Helpline

Bad things don’t usually happen during office hours. If you have a legal emergency, that we can help with please don’t hesitate to get our advice. Helpline is 636-896-4300 call or text us.

Payment Plans

We offer weekly and monthly payments. You can bring payments in our we can schedule them automatically. Payments must be complete before the case closes.

Legal Guides

We have credited several guides for you or your kids. First time getting pulled over. Arrest Guide. DWI Checkpoints. My Parent’s Divorce. Divorce Guide. See downloads here.

Client Portal

We offer clients the ability to view their invoices, payments and balances. The transparency you want. Plus, get text alerts on events, court dates and deadlines. Client Portal.

Bill Byrnes of Byrnes Law Firm

With more than eighteen years of experience, Bill knows his way around the courtroom. He understands the tricks used by the police to convict people, and he knows how to defend against them.

Having won thousands of cases, it’s clear that Bill will fight for you to get the best possible outcome. He starts by going after a dismissal.

If you’re in need of legal assistance in the St. Louis area, contact our criminal defense attorney Bill Byrnes . To learn more about Bill and a his core beliefs that guide him, read more about Criminal Defense Attorney, Bill Byrnes here.

See Cases Won, Awards Received, Practice Areas, FAQ and Articles.

You were always my go to. Thanks for taking care of me, and caring that I could take care of myself!
- Matthew Krueger
Being in a courtroom can be very scary, unfortunately I speak from experience. Best feeling in the world is not having to worry when you know you have Bill in your corner!
- Joel Wallschleager

Payment Plans

Minimum Case Fee To Apply

Warrant Recall +


Bond Reductions +


Credit Requirements

Call For Details

Free consultation

First Office Visit

Criminal Cases


Drug Cases


Drunk Driving


Family Law Consultation

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Flat Fees

Starting at

Traffic Tickets +


Misdemeanors +


Uncontested Divorce

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